Use RGB solid color to paint Ellipse
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF" Height="300" Width="300"> <Canvas Margin="5"> <!--RGB solid color--> <Ellipse Canvas.Top="150" Canvas.Left="70" Fill="#ff0000" Height="100" Width="200" /> </Canvas> </Window>